Burner for incandescent oil-lamps.



(N0 Model) Patented Aug. I5, I899.

, T. J. CRANSTDN. unman FOR mcmnsscsur OIL LAMPS.

(Applicfltion filed. Nov. '19, 189B.)

' UNITED STATES PATENT OFFICE;

THOMAS JAMES ORANSTON, OF FOI/VNHOPE, ENGLAND, ASSIGNOR TO THE 'ERAINOANDESOENT OIL LAMP COMPANY, LIMITED, OF LONDON,

ENGLAND.

BURNER FO R INGANDESCENT OIL-LAMPS.

SPECIFICATION forming part of- Letters Patent No. 631,200, dated August15, 1899.

Application filed November 19, 1898. Serial No. 69981903. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS J AMES CRAN- STON, a citizen of England,residing at Ringfield,Fownhpe, county of Hereford,England,

have invented a certain new and useful Improved Burner for IncandescentOil-Lamps, (for which a patent has been applied for in Great Britain,dated August 18, 1898, No. 17,830,) of which the following is aspecifical0 tlOn.

This invention relates to an improved construction of burners forincandescent oillamps, which I will describe with reference to theaccompanying drawings, in which I 5 Figure 1 shows a vertical section ofthe burner, and Fig. 2 shows a plan.

The burner is mainly similar in construction to one described in anapplication bearing even date herewith-that is to say, it consists of aWick tube a a for the wick b, having a central air-supply space f forair-currents 1 and provided with an inner air-tube e, the wick-tubebeing surrounded by two caps c d and provided with a number of separateair-inlets.-

The essential feature of the present invention consists in the form ofthe inner air-supply tube e. This is fitted within the inner wick-tubea, and its upper end above the wick- 0 tube is enlarged, so as to formfirst a flamespreading flange f, and above this a conical or taperinghead c of which the flat top 6 is imperforate,while the conical surfacehas perforations Z. The bottom of the head is of the 3 5 same diameteras the spreading-flange, while the upper end is reduced to a diameterless than that of the part below the flange f. The part of the tube (2below the spreadingfiange f is provided with helically or ob- 0 liquelyformed slotted holes 2'. The two caps c d (of which the outer one dserves to support the incandescent mantle) are formed with their upperends cylindrical instead of with an inward curvature, as heretofore. The

5 head e on the air-tube e is at its base of I larger internal diameterthan the air-tube itself and extends thence in a concaved form to thetop 6 which is of diminished diameter. The peculiar effect of thisconstruction is that while the under surface f of the head 6 acts as theflame-spreader the lower row of holes in the head being brought by theenlargement of the latter much nearer to the flame and unburned portionsof the vapor the issuing air-jets act with great energy thereon in aslightly upward directed course, and both facilitate the production ofthe perfect blue flame and more effectually spread the same, bringing itagainst the upward-directed sides of the outer cap, which in its turndirects the flame in the most advantageous manner onto the inner surfaceof the mantle a for heating this uniformly to bright incandescence. Alsoby making the holes 1' of a helical form the air and oil-vapors inpassing through have a circular eddying motion imparted to them, wherebya greater uniformity in the character of the flame around the wick isinsured.

In addition to the air-currents 2 and 3, 7o

'passing through the above-described perforations of the air-tube e,air-currents 4: pass through the annular space between the wicktube aand the inner cap 0. Also air-currents 5 pass through holes in cap a andrise through the space between the two caps c and (1, while otherair-currents 6 pass through holes in the gallery below the glass andrise between the latter and the incandescent mantle. The action of theseveral above described air-currents is to produce several differentcombustions. The currents 2 effect a first combustion on the inner edgeof the wick, and the unburned vapors produced by the heat pass partlyupward between the cap 85 c and the spreading-flangef', and partly theypass inward through the slots 11, due to the eddy-currents producedimmediately under the flanged deflector f in order to issue again,together with air, through the holes 1 of the 9Q conical head 6 Onissuing the mixture enters intocombustion, which is supported by theair-currents at and 5,so as to efiect complete combustion. The beforementioned unburned vapors passing up between 0 and f also mix 5 andenter into combustion with the air-currents 4 and combine with the flameabove the The air-currents 6, on the other hand, pass between the mantleand the lampglass for preventing the outward bulging of the formeragainst the latter.

Having thus described the nature of this invention and the best means Iknow of carrying the sameinto practical effect, I claim- 1. In a burnerfor an incandescent oillalnp, the combination with the wick-tubes a a ofa central air-tube 6 with enlarged perforated head 6 of concave taperingform and imperforate top, the under side f of which head constitutes theflame-spreader air-holes 1' below such head, an inner cap 0 withcylindrical upper end extending up to the flamespreader f and an outercap cl with cylindrical upper end extending up to near the top of theenlarged head 6 substantially as described.

2. In a burner for an incandescent oillamp, the combination with thewick-tubes a a of a central air-tube 6 with enlarged perforated head 6of concave tapering form and imperforai'e top the under side f of whichhead constitutes the flame-spreader helicallyslotted air-holes 1' belowsuch head, an inner cap a and an outer cap (1 substantially asdescribed.

3. In a burner for an incandescent oillamp the combination with thewick-tubes a a of a central air-tube e with enlarged perforated head aof concave tapering form and imperforate top, the under side f of whichhead constitutes the flame-spreader, helicallyslotted air-holes 2' belowsuch head, an inner cap 0 with air-holes 4 at its base for supply of airoutside the cap, an outer cap d, and air-holes 6 in the gallery forsupply of air between cap (1 and the chimney-glass, substantially asdescribed.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

THOMAS JAMES ORANS'ION.

Witnesses:

OLIVER IMRAY, JNo. I. M. MILLARD.

